Stepped Frequency Pulse Frequency Diverse Array Radar for Target Localization in Angle and Range Domains

Tan, Ming; Wang, Chun Yang; Li, Zhihui; Li, Xin; Bao, Lei

doi:10.1155/2018/8962048

Cited by 11 publications

(5 citation statements)

References 29 publications

(35 reference statements)

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“…This pulse train where each pulse has a different frequency (tone) is equivalent to a narrow synthetic pulse when processed using the inverse Fourier transform (IDFT) [35] to provide range and velocity information of a target. A detailed discussion on the signal processing of random stepped frequency waveform for a target’s distance and velocity estimation is given in [5,35,36,37,38], while the angle of arrival estimation made possible with the use of multiple receivers is given in [39].…”

Section: Pseudo-random Cyclic Orthogonal Sequencesmentioning

confidence: 99%

Interference Mitigation in Automotive Radars Using Pseudo-Random Cyclic Orthogonal Sequences

Skaria

Al‐Hourani

Evans

et al. 2019

Sensors

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The number of small sophisticated wireless sensors which share the electromagnetic spectrum is expected to grow rapidly over the next decade and interference between these sensors is anticipated to become a major challenge. In this paper we study the interference mechanisms in one such sensor, automotive radars, where our results are directly applicable to a range of other sensor situations. In particular, we study the impact of radar waveform design and the associated receiver processing on the statistics of radar–radar interference and its effects on sensing performance. We propose a novel interference mitigation approach based on pseudo-random cyclic orthogonal sequences (PRCOS), which enable sensors to rapidly learn the interference environment and avoid using frequency overlapping waveforms, which in turn results in a significant interference mitigation with analytically tractable statistical characterization. The performance of our new approach is benchmarked against the popular random stepped frequency waveform sequences (RSFWS), where both simulation and analytic results show considerable interference reduction. Furthermore, we perform experimental measurements on commercially available automotive radars to verify the proposed model and framework.

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Section: Pseudo-random Cyclic Orthogonal Sequencesmentioning

confidence: 99%

Interference Mitigation in Automotive Radars Using Pseudo-Random Cyclic Orthogonal Sequences

Skaria

Al‐Hourani

Evans

et al. 2019

Sensors

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“…Then, the non-zero frequency increment pulse is used to estimate the range of the target. A stepped frequency pulse FDA (SFP-FDA) radar presented in [24] can be regarded as an upgraded version of double-pulse FDA. The first pulse of SFP-FDA radar is same as conventional FDA with a bit of frequency increment.…”

Section: Introductionmentioning

confidence: 99%

Time‐variant focused range‐angle dependent beampattern synthesis by frequency diverse array radar

Ahmad¹,

Shi

Zhou³

et al. 2020

IET signal process.

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The frequency diverse array (FDA) radar has been extensively studied due to its unique range-angle dependent beampattern. Time-invariant spatial patterns have been reported for FDAs proposed so far. However, some recent studies indicate that the patterns obtained by using these methodologies neglect the time-range or frequency-phase relationship, and the definition of time in some equations are misinterpreted which results in erroneous conclusions. Taking the time-variant property of FDA beampatterns into consideration, in this study, the authors propose a short range FDA radar to generate a timevariant focused range-angle dependent transmit beampattern, where chirp waveform with multi-carrier FDA architecture is used. Both the fixed and time-modulated frequency offsets are considered to analyse the proposed FDA radar. The frequency offset employed across each element is generated by chaos sequence and sine function. By compensating the propagation delays of signals, the transmitted signals sum up constructively to focus on the desired range-angle sector only at a specific instant of time. Numerical results are implemented to verify the validity of the proposed schemes.

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“…Owing to its ability of range-angle-dependent, the FDA has exceptional application potential in radar and navigation [5][6][7]. Many studies about FDA have been presented in recent years [8][9][10][11][12][13][14][15][16][17]. Many researchers take their exploration in getting rid of the disadvantages of FDA beampattern such as range-angle coupling [18][19][20] and time-variant [21,22].…”

Section: Introductionmentioning

confidence: 99%

FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments

Tan

Wang

Yuan

et al. 2020

International Journal of Aerospace Engineering

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By utilizing a tiny frequency increment across the array elements, frequency diverse array (FDA) generates a beampattern possessing the property of range-angle-dependent. However, the beampattern of the conventional FDA is "S"-shaped, which means it is coupled in range-angle domains, resulting in low target indication accuracy and poor jamming suppression ability. In this paper, taking advantage of multiple-input multiple-output (MIMO) technique and multiple matched filters, a new FDA framework using Hamming window weighted linear frequency increments is proposed. Correct FDA-MIMO framework and multiple matched filters are used to remove the influence of the time parameter. A range-angle-decoupled beampattern with sharp pencil-shaped mainlobe and low sidelobe levels can be produced. Comparing with the existing FDA-decoupled transmit beampattern design methods, a more focusing beampattern can be achieved. Simulation results validate the superiority of the proposed system.

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Stepped Frequency Pulse Frequency Diverse Array Radar for Target Localization in Angle and Range Domains

Cited by 11 publications

References 29 publications

Interference Mitigation in Automotive Radars Using Pseudo-Random Cyclic Orthogonal Sequences

Interference Mitigation in Automotive Radars Using Pseudo-Random Cyclic Orthogonal Sequences

Time‐variant focused range‐angle dependent beampattern synthesis by frequency diverse array radar

FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments

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